I was going to post this to an older thread where people were having problems with their lighting styles showing up in the dialog box for the lighting effect filter in Photoshop. I was advised to start a new thread about the topic, so I will.

I am using Photoshop 7, and I had the same problem. I noticed inside my lighting styles folder, along with the styles, another lighting styles folder which was empty. I deleted this folder, and viola! My styles are there now!

Excellent! thanks for sharing your solution!